/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/Parameterization/DynamicMeshUVEditor.h
Create new UV island for given Triangles, and set UVs by planar projection to ProjectionFrame. No transforms/etc are applied.
void SetTriangleUVsFromProjection ( const [TArray](API\Runtime\Core\Containers\TArray)< int32 > & Triangles, const [FFrame3d](API\Runtime\GeometryCore\FFrame3d_1) & ProjectionFrame, [FUVEditResult](API\Plugins\DynamicMesh\Parameterization\FUVEditResult) * Result )